#pragma once

#include <iostream>
#include <vector>
#include <semaphore.h>

const int defaultsize = 5;
/*利用环形队列*/
template<class T>
class RingQueue
{
private:
    void p(sem_t &sem)
    {
        sem_wait(&sem);
    }
    void v(sem_t &sem)
    {
        sem_post(&sem);
    }
public:
    RingQueue(int size = defaultsize):_size(size),_ringQueue(size),_p_step(0),_c_step(0)
    {
        sem_init(&_space_sem,0,size);
        sem_init(&_data_sem,0,0);
        pthread_mutex_init(&_p_mutex,nullptr);
        pthread_mutex_init(&_c_mutex,nullptr);

    }
    void Push(const T& in)
    {
        //生产
        p(_space_sem);
        pthread_mutex_lock(&_p_mutex);
        _ringQueue[_p_step] = in;
        _p_step++;
        _p_step %= _size;
        pthread_mutex_unlock(&_p_mutex);
        v(_data_sem);
    }
    void pop(T* out)
    {
        p(_data_sem);
        pthread_mutex_lock(&_c_mutex);
        *out = _ringQueue[_c_step];
        _c_step++;
        _c_step %= _size;
        pthread_mutex_unlock(&_c_mutex);
        v(_space_sem);

    }
    ~RingQueue()
    {
        sem_destroy(&_space_sem);
        sem_destroy(&_data_sem);
        pthread_mutex_destroy(&_p_mutex);
        pthread_mutex_destroy(&_c_mutex);
    }
private:
    std::vector<T> _ringQueue;
    int _size;

    int _p_step;//生产者位置
    int _c_step;//消费者位置

    sem_t _space_sem;//生产者关心的
    sem_t _data_sem;//消费者关心的

    pthread_mutex_t _p_mutex;
    pthread_mutex_t _c_mutex;


};